Canvas-stretcher



(No Model.)

0. P. DODGE.

CANVAS STRETGHER. No. 339,276. Patented Apr. 6 1886.

PEIERS. Phalo'mhognpher. Wishinglun D C.

UNITED STATES PATENT OFFICE;

CHAR LES F. DODGE, OF PHILADELPHIA, PENNSYLVANIA.

CANVAS-STRETCHER.

EPECIIFICATION forming part of Letters Patent NO. 339276, dated April 6, 1886.

Serial No. 152,666. (No model.)

To all whom, it may concern:

Be it known that I, GHAELEs F. DODGE, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in OanvasStretcu ers, of which the following is a specification.

My invention has reference to canvasstretchers, consisting in certain specific improvements, fully set forth in the following specification, and shown in the accompanying drawings, which form part thereof.

The object of my invention is to provide a suitable, cheap, and cplickly-adjust-ahle metallic canvas-stretcher especially adapted for artists use.

In carrying out my invention I provide a socket or body piece having two holes, one being provided with righthand screw-th reads and the other with left-hand screw-threads, into which holes two correspondingly-shaped screws work, and these screws are provided on their ends with means for catching upon the wooden frame supporting the'canvas, the said stretchers being arranged diagonally across the corners of the frame when in use.

Iam aware that li ding-jacks have been made with right and left hand screws, and do not claim such construction, broadly, my invention being specific to a construction of canvasstretcher adapted to a rectangular extensible frame and in which the screws are so shaped as to be capable of turning.

In the drawings, Figure 1 is a perspective view showing a canvas-stretcher embodying my improvement in position upon and supportingthecanvasframe. Figs. 2and3are elevations of modified forms of threaded screws, which may be substituted for those shown in Fig. 1.

A represents the wooden frame-work supporting the canvas, and B the stretcher. This stretcher consists of the link-shaped body 0, having the aperture D, and the hubs E upon each end, and into which hubs the screws F work, one being right hand and the other left hand, so that when the body part G is rotated the set'screws F are drawn or driven apart. The outer ends of these screws are provided with flattened ends or heads G, which may be either formed with knife-edges or separations g, to catch into the wood. If desired, the heads of these screws F maybe provided with teeth, as indicated in Fig. 2, or pointed, as shown in Fig. 3; but I prefer the construction shown in Fig. 1. The screws F are first screwed into the body G, and after the stretcher has been diagonally fixed across a corner and on the inside of the canvasframe so that the points or separations catch in the wood, (see Fig. 1,) the body 0 is then turned, causing both of the screws to be thrust apart and stretching the canvas.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

Therectangular czuivas-franie A, having the corner joints extensible, in combination with a stretcher consisting of a bodysection or s0cket-piece, and a right and left hand screw, F, adapted to work in the ends of the socketpiece, and provided on their outer ends with flattened serrated knife-edges G g, to catch in the inner edges of the wooden frame and prevent the said screws from rotating when the socket-piece is rotated to stretch the frame, the said stretcher being arranged diagonally across the corner of the frame, substantially as and for the purpose specified.

CHAR-LES F. DODGE.

Witnesses:

ROB. JENKINS, WM. BErrs. 

